which greys anatomy character do you think was the loneliest emotionally?

greys anatomy has a lot of emotionally damaged characters but some of them honestly felt deeply lonely underneath everything even when they were constantly surrounded by people. for me cristina was always one of the characters that gave me that feeling the most. not because she didnt have people who loved her but because she constantly seemed emotionally isolated in ways nobody around her fully understood. especially during the periods where she buried herself in surgery and work while clearly struggling mentally underneath all the ambition and confidence. i think thats part of why so many of her scenes hit so hard emotionally because even in crowded rooms she often felt emotionally alone somehow
and honestly greys anatomy was really good at showing that kind of loneliness where someone technically isnt alone but still feels disconnected from everyone around them. which character gave you that feeling the strongest throughout the show and why?